Lubricating oil additives

- Rohm GmbH

Additives for n-paraffin-containing lubricating oils, which additives are mixtures of acrylates containing(I) from 10 to 99 weight percent of polymers P.sub.1 composed of(a) esters of methacrylic acid and/or acrylic acid and linear C.sub.6 to C.sub.15 alcohols;(b) esters of methacrylic acid and/or acrylic acid and linear C.sub.16 to C.sub.30 alcohols;(c) esters of methacrylic acid and/or acrylic acid and branched C.sub.8 to C.sub.40 alcohols;(d) esters of methacrylic acid and/or acrylic acid and C.sub.1 to C.sub.5 alcohols; and(e) monomers having functional groups, the amount of (b) being at the most 5 mol percent; and(II) from 90 to 1 weight percent of polymers P.sub.2 composed of(a') esters of methacrylic acid and/or acrylic acid and linear C.sub.6 to C.sub.15 alcohols;(b') esters of methacrylic acid and/or acrylic acid and linear C.sub.16 to C.sub.30 alcohols;(c') esters of methacrylic acid and/or acrylic acid and branched C.sub.8 to C.sub.40 alcohols;(d') esters of methacrylic acid and/or acrylic acid and C.sub.1 to C.sub.5 alcohols; and(e') monomers having functional groups, the amount of (b') being between 10 and 70 mol percent; and a solvent therefor.

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Description

1 13? -? ? = 4.9? -43? -19? -

.sup.1 Pour Point = -11.degree. C. -

.sup.2 Pour Point = -5.degree. C. -

These examples show that the mixtures in accordance with the invention (Examples 1 to 7) yield better pour point values in both base oils tested than do the prior art additives or additive mixtures (Comparative Examples 1 to 16).

Claims

1. An additive for a lubricating oil containing an n-paraffin, said additive comprising from 20 to 90 percent by weight of a solvent, the balance being a mixture comprising 10-99 percent, by weight of said mixture, of a first polymer component (I) which is at least binary, and from 90-1 percent, by weight of said mixture, of a second polymer component (II),

said first polymer component comprising:
(I) (a) 10-98 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 6-15 carbon atoms;
(I)(b) 0-5 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 16-30 carbon atoms;
(I)(c) 0-90 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a branched alcohol having 8-40 carbon atoms;
(I)(d) 0-50 mol percent therein of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and an alcohol having 1-5 carbon atoms; and
(I)(e) 2-20 mol percent of a monomer capable of free radical polymerization, different from monomers (I)(a)-(I)(d), and having at least one functional group in the molecule, said monomer being selected from the group consisting of compounds of the formula
said second polymer component comprising:
(II)(a') 0-90 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 6-15 carbon atoms;
(II)(b') 10-70 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 16-30 carbon atoms;
(II)(c') 0-90 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a branched alcohol having 8-40 carbon atoms;
(II)(d') 0-50 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and an alcohol having 1-5 carbon atoms; and
(II)(e') 0-20 mol percent of a monomer capable of free radical polymerization, different from monomers (II)(a')-(II)(d'), and having a functional group in its molecule.

2. An additive as in claim 1 which additionally comprises up to 70 percent, by weight of said additive, of at least one member selected from the group consisting of VI-improving olefin copolymers and hydrogenated styrene-diene copolymers.

3. An additive as in claim 2 wherein said solvent is a good solvent for polymer components (I) and (II), a less good solvent for said olefin copolymers by virtue of the polymer components (I) and (II) dissolved therein, and which additionally comprises a stabilizer which is a block or graft copolymer, A-Y, wherein A comprises olefinic monomers and Y comprises acrylate ester and methacrylate ester monomers.

4. An additive as in claim 2 wherein said mixture including polymer components (I) and (II) and said member is from 20 to 80 percent by weight of said component.

5. An additive as in claim 1 wherein polymer component (I)(a) is at least 50 mol percent of said component.

6. An additive as in claim 1 wherein polymer component (I)(a) is 100 mol percent by said component.

7. An additive as in claim 1 wherein polymer component (II)(b') is 20-40 mol percent by weight of said component.

8. An additive as in claim 1 wherein at least one of polymer components (I)(a) and (II)(a') is an ester formed from a linear alcohol having 10-14 carbon atoms.

9. An additive as in claim 1 wherein at least one of polymer components (I)(b) and (II)(b') is an ester formed from a linear alcohol having 16-24 carbon atoms.

10. An additive as in claim 1 wherein at least one of polymer components (I)(c) and (II)(c') is an ester formed from a branched alcohol having 18-22 carbon atoms

11. An additive as in claim 1 wherein at least one of polymer components (I)(c) and (II)(c') is formed from a branched alcohol having 8-20 carbon atoms.

12. An additive as in claim 1 wherein at least one of polymer components (I)(c) and (II)(c') is formed from at least one branched alcohol selected from the group consisting of iso-C.sub.10, iso-C.sub.13, and iso-C.sub.18 alcohols.

13. An oil, containing an n-paraffin which is a member selected from the group consisting of motor lubricating oils and automatic transmission fluid oils and comprising therein 1-10 percent by weight of an additive as in claim 1.

14. An oil, containing an n-paraffin, which is a member selected from the group consisting of hydraulic oils and gear oils and comprising therein 5-30 percent by weight of an additive as in claim 1.

Referenced Cited
U.S. Patent Documents
2091627 August 1937 Bruson
2100993 November 1937 Bruson
2114233 April 1938 Neher et al.
2655479 October 1953 Munday et al.
3513096 May 1970 Brownawell et al.
4149948 April 17, 1979 Wenzel et al.
4282132 August 4, 1981 Benda et al.
4290925 September 22, 1981 Pennewiss et al.
4822508 April 18, 1989 Pennewiss et al.
Foreign Patent Documents
2258966 June 1973 DEX
1559951 January 1980 GBX
1559952 January 1980 GBX
Other references
  • Morawetz, "Macromolecules in Solution", vol. XXI of High Polymers, Interscience Publishers, (1965), pp. 85-89.
Patent History
Patent number: 4968444
Type: Grant
Filed: Dec 27, 1988
Date of Patent: Nov 6, 1990
Assignee: Rohm GmbH (Darmstadt)
Inventors: Helmut Knoell (Lantertal), Ulrich Schoedel (Rossdorf), Horst Pennewiss (Darmstadt), Heinz Jost (Modautal)
Primary Examiner: Margaret B. Medley
Law Firm: Curtis, Morris & Safford
Application Number: 7/291,387
Classifications
Current U.S. Class: 252/56R; 252/515R; 252/56S; Organic Compounds Of Nonmetals Other Than C, H, And O (252/77); Carboxylic Organic Compounds Containing (252/79)
International Classification: C10M14514;